Intercepting-trap.



W. tmmmm.l INTEROEPTING TRAR APPLICATION FILED-.TUNE 22. 1909.'

981,593. Patented Jan. 10,1911.

2 SHEETS- SHEET 1. i

f 3a *M Mw W. T. DUNCAN. INTEECBPTING TRAP. APPLIoATIoN FILED JUNE 22.1900.

PatentedJan. 10, 1911.

2 SHEETS-SHEET-Z.

Inventar' v Zlf. uno 555 j? WILLIAM T. DUNCAN, 0F LOS ANGELES,CALIFORNIA.

INTERCEP'IINGr-TRAP.

senses.

Specification of Letters Patent.

Patented J an. 10, 1911.

Application filed June 22, 1909. Serial No. 503,630.

T o all whom it may concern:

Be it known that I, IVILLIAM T. DUNCAN, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented certain new and useful Improvements inIntercepting-Traps, of which the following is a specification.

My invention pertains to traps, and it has special reference to what isknown in the art as grease traps, which are adapted to be attached toclosets and sinks, or the like, whereby grease and other foreignsubstances are arrested and may be removed, so as to preventobstructions in pipes. The invention is applicable to other uses whereit is desired to remove or catch any solid matter which may be in theliquid or solution. In this application I sho-w the manner of applyingit particularly to sinks and closets, as will now be set forthin-detail.

In the drawing, Figure 1 is a side elevation of my improved grease trap.F ig. 2 a central vertical section of the trap. Fig. 3 is a perspectiveview of the removable screening grid. Fig'. 4 is a horizontal section ofthe shell, on line 4 of Fig. 2; and, Fig'. 5 is a view of the lower endof the shell, showing' the removable base and spider which secures thebase to the shell.

In constructing my invention I provide a cylindrical shell 6, ofsuitable size, which may be of cast metal, or otherwise. This has aclosed top or end, and an open lower end, this lower end having anexterior flange or rim 7, with three cut-away parts 8. Midway betweenthe ends are projecting lugs or ears 9, having therein vertical holes toreceive the upper ends` of the legs or standards 10, these standardshaving, preferably, threaded ends, as at 11, which pass through theholes in the ears 9, and are secured to said ears by jam nuts 12, aboveand below said ears. Near the lower end of the shell is a threaded inletboss 13 to which the discharge pipe from the sink is secured, and nearthe upper end -of the shell, and located at any convenient point,relatively to the boss below, vis a boss 14, threaded as shown, to whichthe outlet or discharge pipe is attached. The lower end of the shell hasa removable plate 15, and both the plate and the lower end of the shellare provided with grooves 16 to receive a strip of packing 17.

A spider 18, with three arms 19, which eX- tend upwardly and havevertically disposed bends 2O at the ends, terminating in inturned hooks20, so that when the plate 15 is placed in position and the hooks of thespider are passed through the cut-away portions 8 of the flange 7 thespider may be slightly turned, similar to the bayonet joint connection,thus holding the plate in position, after which the threaded stem 21,

which passes centrally through the spider and engages with the plate,may be screwed up by the hand wheel 22, and thus bind the plate againstthe base of the shell.

Interiorly I provide a removable cage, having a series of grids orstrainers. This comprises a rigid'bent wire 23, secured at its lowerends to the plate by means of screws 24, so they may be readilydetached, and on the wire'standard thus formed I mount, as in thisinstance, three grids or straining elements, and a disk 25 at the upperend. These grids are designed for the special uses to which they may beput, but in this case, and for the purposes herein specified, I providefor each grid a ring 25, which lits snugly within the shell, and formsthe screen with a plurality of cross Wires 26, placed close together, asshown.

It will be observed that I place a cock 27 l near the base of the shell,which is used for draining the shell preparatory to cleaning the same.

As the grid frame 23 is readily removable from the plate 15, I may, forcertain uses, make them separate, so that for cleaning purposes thegrids within need not be removed with t-he plate 15, but in using it asa grease trap it is desirable that these two elements should be attachedto each other and removable whenever the trap is .to be cleaned.

This form and arrangement of trap is easily attached to any closet orsink, and can be readily cleaned, and it will catch all foreignsubstances passing into the trap, and since the straining grids havelarge surfaces it is not likely to clog up in use.

The object of the. disk 25 on the upper end of the straining grid frameis to draw out the impurities when the straining grids are removed, asthe disk is, normally, above the outlets of the shell.

What I claim as new, is:

1. In a grease trap, a cylindrical shell closed at its upper end andopen at its lower end, provided with inlet and outlet ports, a removableclosure plate at the lower end having attached thereto, and removablewith said closure plate, straining grids in a plane transverse to thelongitudinal aXis of the shell, an inlet pipe below the straininggrid,and outlets above the straining grids.

2. In a grease trap, a cylindrical shell closed at its upper end andopen below and having an inlet port at its lower end and an outlet portat its upper end, an external Aflange at its lower en'd having cut-awayportions, a closure plate and means for securing the same vto 'theshell, 'a series of straining grids within the shell, and attached tothe closure plate, said grids being rlocated between theinleta'ndfoutlet ports,fanda disk -on the upper end ofthe straining gridframe above lthe outlet ports.

3. In a grease trap, a vertically-disposed shell having inlet ports, aclosure plate at the lower end, a vertical frame within said shellsecured to said closure plate, a plurality of straining grids on saidvertical frame on a vplane transverse to the longitudinal axis of theshell and between the inlet and outlet ports, and a disk on the upperend of the grid frame to draw out the impurities when the said frame isremoved.

Signedat the city of Los Angeles, State of California, this 8d day ofApril, 1909, in

the presence of witnesses.

WILLIAM T. DUNCAN. Witnesses J. S. ZERBE, WV. H. ANDERSON.

